<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<select id="na" name="" onchange="bb()">
			<option value="">请选择网站</option>
			<option value ="http://www.baidu.com">百度</option>
			<option value ="http://www.4399.com/">4399</option>
			<option value ="http://www.7k7k.com/">7k7k</option>
		</select>
	</body>
	<script type="text/javascript">
			function bb(){
				var cc=document.getElementById('na').value;
				 location.href = cc ;
			}
	</script>
</html>
